GPS Camera Tracker& Navigation with taximeter and printer 1. Screen ... ,Support TCP, UDP, SMS to convey positioning and alarm messages. 12,Precise positioning: error less than 15 meters ... -boot time: less than 90 seconds16,Emergency and alarm function17,Anti excess voltage, preventing power supply polarity ... , communication module is a Tri-band GSM/GPRS engine that works on frequencies EGSM 900 MHz, DCS ...